Hi James,

Yes, objects may be imported in either IGES, SAT, or STEP format, and once imported, an object may have optical properties such as coatings, glass, and scattering functions applied, and then be ray traced like any other optical component.

To import an object, set the object type to “CAD Part: STEP/IGES/SAT” and select the file name from the drop-down box, or place the file name in the comment column. The file must reside in the \CAD Files folder and end in the extension IGS, IGES, SAT, STP, STEP, or SAB. The extension must be included with the file name on the comment column.

This article describe how to import CAD objects into OpticStudio:

How to import CAD objects · MyZemax